Everything in the World exept Universal is varying, since all common processes are in the dynamic flow of changes.
Therefore, Asanas look static only on the outside. But by they are dynamic by their essence. Fixing the body in any form requires muscle work to keep this form. And, therefore, all Asanas involve muscle work or stretching and are, in fact, not static, because any tension is related to the dynamic process of fatigue and relevant changes in all bodies. Exceptions to this rule are Shavasana, the posture of «conscious self-shutdown», and the «perfect meditating posture», done with the body fully balanced and relaxed in the sitting position.
The remaining postures, although they look static externally, but «on the inside» they require the technique of «diving into depth» and overcoming the limits of the Marginal Mobility Circle. This is usually achieved by increasing the tension of necessarily switched muscle sectors shaping the body, and by lengthening necessarily stretched muscle sectors.
The summary vector of efforts in such «static postures» is always directed perpendicular, with respect to the line of the limit of the Marginal Mobility Circle. And in accordance with the main goal, which is overcoming this limit, such postures are «extra-marginal».
If a «static posture» (for example, strength or balance-based posture) does not employ «diving into the depth» and is fixed «inside» the Marginal Mobility Circle without overcoming mobility limitations, the dynamics of change are created by increasing muscle fatigue.
As to dynamic exercises of any complexity level can be referred to as «links» (dynamic transfers from one extra-marginal posture to another «inside» the Marginal Circle), or to the group of energy distribution movements, and they are dynamic by the definition. At the same time their practice is also related to overcoming the Limit, but of another nature, i. e., the limit of dynamic endurance or energy tendencies.
Training always requires actions related to transition processes. In the course of training, directions of vectors transforming «extra-marginal» efforts, methods and techniques may vary from stretching-based (extending the limits of the Mobility Circle) to those aimed at developing endurance and adaptation to the density of energy flows. But the essence of the dynamic characteristic of the flow in this case always remains unchanged.
A truly static stage may only be achieved in the non-doing of the contemplation practices, however, not at the early stage of learning these techniques and not during starting creation of one’s mood when transitory processes are still presented, but at the final stage of a perfect Samadhi.